The main characters are decided, they will be each one form its respectve game:
StreetFighter: Sakura, Chunli

DarkStalkers: Felicia, Morrigan, Lilith

Seiken Desetsu 3: Angela, Lise

KOF: Mai Shiranui, Athena Asamiya

The plot will be in the world of seiken desetsu 3, but involving all these charcters.
I guess in a few days i will post a full resolution of the image below of all the girls in full color and detail.